Sound reproducing device



A g. J- M W. SOUND REPRODUCI'NG DEVICE 2 Sheets-Sheet 1 Filed July. 26,1929 Aug. 18, 1931. J. M W. STONE 1,819,721

SOUND REPRODUCING DEVICE Filed July 26. 1929 2 Sheets-Shee 2 HUIIMAHHPatented Aug. 18, 1931 UNITED STATES PATENT OFFICE JOHN MCWILLIAMSSTONE, OF ST. CHARLES, ILLINOIS, ASSIGNOR TO QPERADIO MANU-FACTUBINGfCQ, OF ST. CHARLES, ILLINOIS, A COBPOBATION OF ILLINOIS SOUNDREPRODIJ'CING DEVICE Application filed July 26, 1929. Serial No.381,206.

My invention relates to sound reproducing devices, and has amongitsother objects the production of devices of the kind described that areneat and attractive in appearance,

gaefiicient and'satisfactory for use wherever speaker which embodies myinvention;

Fig. 2 is a plan elevationof the improved loud speaker I Fig. 3 is anenlarged section taken on line '3-3 of Fig. 1;

Fig. 4 is an enlarged fragmentary section taken on the same line as Fig.8, and

Fig. 5 is a vertical sectional section taken through aloud speaker whichembodies 'another form of the invention.

Referring for the present toFigs. 1 to 4,

inclusive, wherein I have illustrated aloud P speaker embodying apreferred form of the.

invention, the reference character identifies a battle or panel which issubstantially rectangular in'form, although it is preferably providedwith ornamental top and bottom portions 11 and 12, respectively. The

panel 10 isprovided with an aperture 14 in which a grille 15 ispreferably positioned.

Disposed in back of the opening 14 and carried by the panel is a loudspeaker which is identified generally by the reference character 16. Theloud speaker may be of any suitable construction, but inthis instance isof the electro-dynamic type, and comprises a diaphragm 17 which has aconical portion 18 actuated by a winding (not shown) disposed in anannular magnetic field (not shown) the annular magnetic field beingformed by a magnetizing structure 20 which is carried by a ring 21secured to the panel 10 by screws 23. A felt ring 24 is preferablypositioned between the ring 21 and the panel 10.

Secured to the ring 21 by the screws 23 is a housing member 27 which ispreferably frusto-conica-l in form for a purpose presently to bedescribed. The housing member 27 co operates with the ring 21 to carry aplurality of felt rings 29between which the periphcry of the diaphragm17 is positioned. Mounted upon the housing 27 is an input transformer 30which has its second winding electrically connected to theaforementioned winding (not shown).

Preferably positioned beneath the loud speaker 16 and also carried bythe panel 1.0

is a means comprising a transformer 32 and a rectifying tube33 forsupplying direct cur-- rent to the magnetizing structure 20. At; thelower end of the panel 10, and secured to the back surface thereof is aswitchdevice 34, whereby the operation of the loud speaker iscontrolled.

Projecting from the rear surface of the panel 10 at the upper endthereof is a bra'ck et member 38 which is preferably triangular in formand is preferably secured to the panel 10 by a metallicbracket member39, the bracket member 39 being secured to the anel 10 by screws 40. Itmay be mentioned that the panel 10 and the bracket member 88 arepreferably formed from wood, or some other relatively light material.

Secured to the bracket members 38 and 39 by nuts 42 is a screw-eye 44,whereby the panel may be suspended from an overhead support by anysuitable means. In the preferred embodiment of the invention a wire 45,or the equivalent, is employed to suspend the panel from a ceiling, orany other overhead support in a room. Thus, in Fig. 3, I have indicateda ceiling 47 from which a screw-eye 48 projects, andthe wire has' aroom. In Fig. 2, I have indicated thewalls of aroom by dot and dashlines, and it will be noted that the triangular bracket 38 correspondsto the angle between the walls at the corner of the room. To prevent thebracket member 38 from marring the walls of a room, I preferably providea buffer member 50 formed of suitable soft material, such as felt, orthe equivalent, to engage the Walls. For a like purpose, I preferablyprovide rabbets 52 in the vertical edges of the panel 10 and glue strips53 of suitable soft material, such as felt, or the like, in the rabbets,the construction being such that the strips 53 engage the walls of theroom and prevent injury thereto.

As will be evident from an inspection of Fig. 3, the improved device isconstruct-ed in such manner that its center of gravity lies in front ofthe screw-eye 4:1 and therefore the panel 10 rests against the walls ofthe room and does not swing back and forth.

A function of the panel 10 is to serve as a bafile to prevent the soundwaves projected from one side of the diaphragm from suppressing thesound waves projected from the otherside thereof. As the side edges ofthe panel are straight and vertical, they co-operate with the walls ofthe room to perform the same function and there is no materialinterference between the sound projected from the two sides of thediaphragm even though the panel is relatively narrow.

In Fig. 5, I have illustrated another embodiment of the invention whichcomprises a panel 10a preferably identical in construction to theaforementioned panel 10. The panel 10a is adapted to be suspended froman overhead support by means comprising a bracket member 88a which isrigidly secured to the panel 10a by a metallic bracket member 39a. Ascrew-eye id-a secured to the bracket members 38a and 39a has the samefunction as the above described screw-eye 44. Disposed in back of anaperture 14a provided in the panel 10a is a loud speaker 100 of themagnetic type. In this instance the loud speaker 100 comprises adiaphragm 101 which has its central portion connected to an armature122, the armature 122 being disposed in the field of a permanent magnet123. The magnet 123 is carried by a bracket 124: mounted upon a plate125 which is rigidly secured to the panel 10a by bracket members 107.

lVhile I have shown and described certain embodiments of my invention,it is to be understood that it is capable of many modifications.Changes, therefore, in the construction and arrangement may be madewithout departing from the spirit and scope of the invention asdisclosed in the appended claims. in which it is my intention to claimall novelty inherent in my invention as broadly as possible, in view ofthe prior art.

lVhat I claim as new is:

1. A device of the kind described comprising an apertured baflie member,a loud speaker carried by said bafile member and having a diaphragmlocated at said aperture, means for suspending said baflle men'iber froman overhead support, and yielding material at the edges of the panel forengaging and protecting the walls of a room on which said de vice may beplaced.

2. A device of the kind described comprising a baflie member, a loudspeaker carried by said ballle member, means for supporting said bailiemember in the corner of a room, and means formed of relatively softmaterial and carried by said baffle member for engaging the walls of theroom at said corner and protecting them from being marred by said bafflemember.

3. he combination with a device of the kind described comprising a paneland a loud speaker carried by said panel, of a brack- -t projecting fromsaid panel and equipped with flexible means for suspending said paneland loud speaker as a unit from an overhead support, said flexible meansbeing attached to said device in back of the center of gravity thereof.

l. A device of the kind described comprising a loud speaker, a bafflesupporting said loud speaker, said baffle having vertically disposededges, means for supporting said device adjacent a wall, and yieldingmeans at said edges for protecting and engaging said wall.

5. A device of the kind described comprising a vertically disposedpanel, a loud speaker carried by the panel, a bracket projecting fromthe panel, and means secured to the bracket for supporting said panelfrom an overhead support. I

6. A device of the kind described comprising a vertically disposedpanel. aloud speaker carried by the panel, a bracket projecting from thepanel, and flexible means secured to said bracket for supporting saidpanel from an overhead support.

7. A device of the kind described comprising a panel having verticallydisposed edges, a loud speaker carried by said panel, a bracketprojecting from said panel, means secured to said bracket for supportingsaid panel adjacent a wall, and yielding means at said edges forprotecting said wall.

8. A device of the kind described comprising a panel having verticallydisposed edges a loud speaker carried by said panel, a bracketprojecting from said panel, yielding means secured to said bracket forsupporting said panel adjacent a wall, and yielding means at said edgesfor protecting said w l.

9. A device of the kind described omprising a vertically disposed panelhaving an aperture therein, loud speaker disposed in said aperture andcarr ed by said panel, a bracket projecting from said panel, and

5 bafiie, a transformer and a rectifier carried means secured to saidbracket in back of the center of gravity of said device for suspendingsaid device from an overhead support.

10. A device of the kind described comprising a vertically disposedpanel having an aperture therein, a loud speaker disposed in saidaperture and carried by said panel, a bracket projecting from saidpanel, and flexible meanssecured to said bracket in back of the centerof gravity of said device for suspending said device from an overheadsupport.

11. A deviceof the kind described comprising a baflie, a loud speakercarried by said device in back ofthe. center of gravity there of forsuspending it from an overhead support.

13. A device of the kind described com prising a bafile having anaperture therein,

a loud speaker mounted on said baflie and equipped with a diaphragmalined'with said aperture, and a bracket projecting from said 'bafliefor suspending it adjacent a wall of a room above the floor thereof.

14. A device of the kind described comprising a baflie having anaperture therein, aloud speaker mounted on said baflle and equipped witha diaphragm disposed at said aperture, and means at the upper end ofsaid baffle for. supporting it in a room so that it co-operates with awall of the room to prevent the sound waves projected from one side ofthe diaphragm from suppressing sound waves projected from the oppositeside thereof.

1 5. A device of the kind described comprising a baflie having anaperture therein, and a loud speaker mounted on said bafile and equippedwith a diaphragm disposed at said aperture, means for mounting saidbaffie adjacent a wall, said baflie being formed to co-operate with saidwall to prevent sound waves projected from one side of the diaphragmfrom suppressing sound waves projected from the other side thereof.

16. A device of the kind described comprising a baffle, a loud speakercarried by said baflie and provided with a. diaphragm, and means formounting said bafile in a corner of a room, said bafile being shaped toco-operate with the walls of said room to prevent the sound wavesprojected from one side of said diaphragm from suppressing the prising asubstantiall sound waves projected from the other side thereof.

17. A device of the kind described comrectangular baflle having verticalside e ges, a loud speaker carried by said bafiie, and means forsupporting said baffle in a corner to have its vertical edges engage thewalls forming the corner.

In testimony whereof, I have hereunto set my hand, this 3d day of July,1929.

. J. MGWILLIAMS STONE.

